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CENTRAL DRAFT LAMP. No. 428,882. Patented May 27, 1890.

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UNITED STATES PATENT OFFICE.

ROLAND L. BREWVER, OF MERIDEN, CONNECTICUT, ASSIGNOR TO THE EDWARDMILLER & COMPANY, OF SAME PLACE.

CENTRAL-DRAFT LAM P.

SPECIFICATION forming part of Letters Patent No. 428,882, dated May 27,1890.

Application filed March 25, 1889- Serial No. 804,650. (No model.)

To all whom it may concern:

Be it known that I, ROLAND L. BREWER, of Meriden, in the county of NewHaven and State of Connecticut, have invented a new Improvement-inCentral-Draft Lamps; and I do hereby declare the following, when takenin connection with accompanying drawings and the letters of referencemarked thereon, to be a full, clear, and exact description of the same,and which said drawings constitute part of this specification, andrepresent, in-

Figure 1, a vertical central section of so much of a burner as isnecessary to illustrate the invention; Fig. 2, a modification in theformation of the enlarged surface of the upper end of the tube; Figs. 3and i, vertical sections representing the manner of forming thesupporting-rib in the distributer.

This invention relates to an improvement in that class of lamps in whicha wick surrounds a central tube, open from the bottom, and so as toadmit air through the said central tube for the support of combustion,commonly called Argand or central-draft lamps.

In the usual construction the central tube, around which the wickstands, is necessarily thin, and at its upper edge presents only thisthin edge between the wick and the air-passage. The result of this isthat when the wick is in the up or burning position and the fount wellfilled the natural flow of the oil through the wick is frequentlygreater than the consumption, so that the oil rising to the top of thewick comes to the end of the inner tube, and that being thin permits theeasy escape of the oil from the wick side of the tube over the end ofthe tube to the inside of the tube, whence it naturally flows downward.In many of these lamps drips are provided at the lower end of the tubeto receive such overflow of the oil. This difficulty is more marked inthe class of lamps of the type commonly known as the Rochester lamps, inwhich a perforated thimble is arranged in the upper end of the innertube, and, extending upward, is perforated above the tube for thedistribution of air into the flame. This thimble substantially fits orstands in close relation to the inside of the central tube and forms aneasy conductor for the oil over the I have found that the overflow ispractically due to the very thin edge of the central tube, and that if asubstantially horizontal surface be formed at the upper end of the tubeinside the wick the flow-of oil will not pass over that surface and soas to reach the air-distributer, but that the oil will be consumedbefore it can reach the inner surface of the tube or make contact withthe distributer. My invention therefore consists in constructin g thecentral tube with an inward annular projection at its upper end,producing substantially a horizontal surface on the upper end of thetube between the wick and the air-(:listributer, combined with a tubularairdistributer, closed at its upper end, and its side walls perforatedand con stru cted with a closed annular rib adapted to rest on the saidinward projection of the upper end of the tube, as more fullyhereinafter described.

In illustrating the invention I show only so much of a burner as isnecessary to its understanding.

A represents the outer tube, and B the central tube; C, the wickarranged between the said two tubes in the usual manner. The inner tubeis constructed in the usual manner; but instead of the tube extending ofuniform thickness to its upper end, I construct the tube at the upperend with an inward projection a, and so as to present a substantiallyhorizontal flat surface at the upper end of the tube, considerablygreater than the thickness of the tube itself. This projection may bemade by turning the upper end of the tube inward and downward, as seenin Fig. 1, it only being essential to the invention that the upper endof the tube shall have an inward projection at its upper encl,avl1ichwill present a broad surface in substantially a horizontal plane. Aslight inclination of the upper surface, rising from the wick, may bedesirablesuch as seen in Fig. 2; butpractically a substantiallyhorizontal surface accomplishes the result in a satisfactory manner.

1) represents the air-distrilniter. This is made of a diametercorresponding to the internal diameter of the projection a, and so as tosubstantially fit therein. It is closed atits upper end and its sidesperforated in the usual manner. To support the distributer in the properrelation to the upper end of the tube, it is constructed with an annularrib I). This rib is formed, as seen in Fig. 3, by first throwing out anannular bead (Z, and then closing that head, as seen in Fig. 4, so as toform a thin annular rib just sufiicient to take a hearing on the inwardprojection a around the upper end of the tube. The inward projection amay be constructed with a flange e at its lower edge, as seen in Fig. 2,upon which the distributor may rest.

I claim- In a central-draft lamp, the central tube constructed. with aninward annular projection .at its upper end, and so as to form a surfaceon the upper end of the tube greater than the thickness of the tube,combined with an air-distributer 1), closed at its upper end, its sidewalls perforated, and of a diameter corresponding substantially to theinternal diameter of the said projection, the said distributorconstructed with an annular closed rib Z), adapted to rest upon theupper surface of the said projection, substantially as described.

ROLAND L. BREWER.

\Vitncsses:

Jon E. EARLE, FRED 0. EARLE.

